Don't show linked device setting on slave devices

Signal/src/ViewControllers/AppSettings/AppSettingsViewController.m

@@ -200,11 +200,13 @@
                                               actionBlock:^{
                                                   [weakSelf showNotifications];
                                               }]];
+    if (isMasterDevice) {
         [section addItem:[OWSTableItem disclosureItemWithText:NSLocalizedString(@"Linked Devices", @"")
                                       accessibilityIdentifier:ACCESSIBILITY_IDENTIFIER_WITH_NAME(self, @"linked_devices")
                                                   actionBlock:^{
                                                       [weakSelf showLinkedDevices];
                                                   }]];
+    }
     // Loki: Original code
     // ========
 //    [section addItem:[OWSTableItem disclosureItemWithText:NSLocalizedString(@"SETTINGS_ADVANCED_TITLE", @"")